the coming of night; the end of daylight; dusk.

1605–15; night + fall

twilight, sundown. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nightfall (ˈnaɪtˌfɔːl)
the approach of darkness; dusk

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
He was supposed to be evacuated that day, but communication problems and the
  darkness of nightfall made it impossible.
The lights stay on longer, as people have to eat after nightfall.
The few bulldozers that arrived promptly to sift through the rubble stopped
  working at nightfall.
By nightfall, the shower of debris had grown denser-and deadlier.
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